The Racermate Challenge II is a cycling training simulation game developed exclusively for the Nintendo Entertainment System (NES). Published by RacerMate, it delivers an interactive indoor training experience for cyclists by connecting a real bicycle to the game system. The full kit includes a special game cartridge, interface box, handlebar display, and bike trainer. Players mount their bike on the trainer and link it to the NES console via the interface box. The game tracks riders’ speed and power output in real time and displays the data on screen. Players can choose from various courses like mountain tracks for extra challenge and race against virtual opponents. Due to its required specialized hardware and lack of official licensing, the game is quite rare on the market.